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January 31, 2015

January 31, 2015

Posted by **Lucy** on Saturday, August 23, 2008 at 2:39pm.

1) Find the height of the building to the nearest foot

2) find the length of the shadow to the nearest foot

If 0 degrees </= 360 degrees, solve the equation, sec x= -2. I do not know how to solve this and cannot find an example in my book.

Thanks for all your help!

- Pre-calculus -
**Reiny**, Saturday, August 23, 2008 at 2:47pm<If 0 degrees </= 360 degrees, solve the equation, sec x= -2. I do not know how to solve this and cannot find an example in my book. >

if sec x = -2, then cosx = -1/2

You should know that cos 60 = +1/2

so the angle x must be in quadrants II or III

so the angle x = 180-60 or 120 degrees or

x = 180+60 = 240 degrees

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